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[Kernel] SM120: stop routing misaligned-M blockwise FP8 GEMMs to the small-M swapAB config #52775

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Merged
ZJY0516 merged 1 commit into from
Aug 19, 2026
+1 −1
Merged

[Kernel] SM120: stop routing misaligned-M blockwise FP8 GEMMs to the small-M swapAB config #52775

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2 changes: 1 addition & 1 deletion .../libtorch_stable/quantization/w8a8/cutlass/c3x/scaled_mm_blockwise_sm120_fp8_dispatch.cuh
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Expand Up @@ -250,7 +250,7 @@ void cutlass_gemm_blockwise_sm120_fp8_dispatch(torch::stable::Tensor& out,
torch::stable::Tensor const& b_scales) {
int M = a.size(0);
// more heuristic tuning can be done here by checking N/K dimensions as well
bool swap_ab = (M <= 64) || (M % 4 != 0);
bool swap_ab = (M <= 64);

if (!swap_ab) {
if (M <= 256) {
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